[seqfan] Re: Langford sequences

Neil Sloane njasloane at gmail.com
Mon Feb 22 14:12:41 CET 2016


I added a link to
Ali Assarpour, Amotz Bar-Noy, Ou Liuo, <a href="
http://arxiv.org/abs/1507.00315">Counting the Number of Langford Skolem
Pairings</a>, arXiv:1507.00315, 2015.
to all 4 of the entries A014552, A059106, A176127, A004075.

I haven't updated the entries yet. But is there any reason to doubt that
the new values are the correct ones?

Best regards
Neil

Neil J. A. Sloane, President, OEIS Foundation.
11 South Adelaide Avenue, Highland Park, NJ 08904, USA.
Also Visiting Scientist, Math. Dept., Rutgers University, Piscataway, NJ.
Phone: 732 828 6098; home page: http://NeilSloane.com
Email: njasloane at gmail.com


On Sun, Feb 21, 2016 at 6:30 PM, William Marshall <w.r.marshall at actrix.co.nz
> wrote:

> The OEIS lists A014552(27) = 111683606778027803456, calculated by a group
> headed by Krajecki, but this is now in doubt as a second group led by
> Bar-Noy calculated a(27) as 111683611098764903232 in July last year. (This
> also puts the value of A176127(27) listed on the OEIS in doubt.)
>
> Therefore someone needs to verify which of these values (if either) is
> correct.
>
> The Bar-Noy group also claims that a(28) = 1607383260609382393152, but
> this still appears to be unverified too.
>
> Bar-Noy also claims new values for the Nickerson variant (A059106), with
> a(24) = 102388058845620672 and a(25) = 1317281759888482688.
>
> Their paper is available at http://arxiv.org/abs/1507.00315.
>
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